<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .circle-box {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            width: 500px;
            height: 500px;
            border: 1px solid #ddd;
        }

        .ball {
            position: absolute;
            width: 50px;
            height: 50px;
            top: 50%;
            left: 50%;
            margin: -25px 0 0 -25px;
            border-radius: 50%;
            background: #03a9f4;
            animation: round linear 10s infinite;
        }

        @keyframes round {
            from {
                transform: rotate(0) translate(250px);
            }
            to {
                transform: rotate(360deg) translate(250px);
            }
        }
    </style>
</head>
<body>
<div class="circle-box">
    <div class="ball"></div>
</div>
</body>
</html>
